response-format.interceptor.ts

import type {
  CallHandler,
  ExecutionContext,
  NestInterceptor,
} from '@nestjs/common';

import { Injectable } from '@nestjs/common';
import { map, type Observable } from 'rxjs';

@Injectable()
export class ResponseFormatInterceptor implements NestInterceptor {
  public intercept(
    context: ExecutionContext,
    next: CallHandler,
  ): Observable<unknown> {
    const ctx = context.switchToHttp();
    const response = ctx.getResponse();

    return next.handle().pipe(
      map((data) => {
        return {
          statusCode: response.statusCode,
          data,
        };
      }),
    );
  }
}